Written by J.H. Paton in 1880. This was the first book circulated by the Watch Tower magazine, edited by Charles Taze Russell, and is mentioned several times in the years 1880 and 1881 in that magazine. The magazine is now known as the Watchtower and is now circulated by Jehovah's Witnesses. Paton and Russell parted company in 1881 and the book was later republished by Paton in 1890, but with several revisions. This is the original 1880 edition which was endorsed by the Watch Tower magazine.
It's theme is stated on page 79: "Our claim is that the period is revealed, during which Christ comes, the living generation will be judged, the dead in Christ raised, the living changed, the nations overwhelmed in a time of trouble, the Jews restored, and the whole church of Christ glorified, ready for the glorious millennial reign; but that we are left without definite time to the change of translation expected. We believe that period is one of forty years and commenced in 1874, and will reach to 1914. This period is the time for the disposal of the church and nations are now existing, and is in that sense the harvest. It is the time of exaltation of both Jewish and gospel churches to their position for millennial work, and hence is the day-dawn. The glorious light shining on God’s plan of the ages is in harmony with our claim as to the time."